You can't have animations with PDFs. Anyone using beamer is familiar with this frustration. But animations are incredibly helpful in explaining many works. 3Blue1Brown became so popular in major part due to his use of (fantastic) animations that more easily explain the material than any static image could.
The animate package from CTAN draws animations in PDFs. It has limitations (most pdf readers won't show them because they rely on some JavaScript), but it does work.
Adobe works. I've heard of at least one other but I couldn't get it to go. People say Adobe Reader is bloated, but if you need it then it is not bloat.
